High Richness of Vascular Plants in the Tropical Los Tuxtlas Region, Mexico

Villaseñor, José Luís; Ortíz, Enrique; Campos-Villanueva, Álvaro

doi:10.1177/1940082918764259

Cited by 22 publications

(21 citation statements)

References 31 publications

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“…The two regions share more than 60% of their flora (Villaseñor et al. ) but have contrasting land‐use change patterns and history. Deforestation in LTX began in the early 1960s, mainly for cattle pasture expansion in lowland areas (<700 m above sea level).…”

Section: Methodsmentioning

confidence: 99%

Regional context and dispersal mode drive the impact of landscape structure on seed dispersal

San‐José

Arroyo‐Rodríguez

Meave

2019

Ecological Applications

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Land‐use change modifies the spatial structure of tropical landscapes, shaping global biodiversity patterns. Yet, it remains unknown how key ecological processes, such as seed dispersal, can be affected by changes in landscape patterns, and whether such effects differ among regions with different climate and disturbance intensity. We assessed the effect of five landscape metrics (forest cover, matrix openness, forest edge density, forest fragmentation, and interpatch distance) on the seed rain recorded in two Mexican fragmented regions (20 forest sites per region): the more deforested, defaunated, and windy Los Tuxtlas rainforest (LTX), and the better‐preserved Lacandona rainforest (LAC). We quantified the proportions of dispersed tree species and their seeds, separately evaluating wind‐ and animal‐dispersed species. Our findings support the hypothesis that forest loss is more important than fragmentation per se, negatively impacting the seed rain in both regions. As expected, landscape patterns were comparatively more important for wind‐dispersed seeds in LTX, probably because of stronger wind events in this region. Specifically, proportions of wind‐dispersed seeds and species decreased with increasing edge density, suggesting that forest edges prevent dispersal of wind‐dispersed species, which may occur if edges create physical barriers that limit wind flow. This pattern can also be caused by source limitation in landscapes with more forest edges, as tree mortality rates usually increase at forest edges. The wind‐dispersed seed rain was also positively related to matrix openness, especially in LTX, where wind flow can be favored by the dominance of treeless anthropogenic matrices. Surprisingly, the proportion of animal‐dispersed seeds in LTX was positively related to matrix openness and patch isolation, suggesting that seed dispersers in more deforested regions may be forced to concentrate in isolated patches and use the available habitat more intensively. Yet, as expected, patch isolation limited wind‐dispersed seeds in LAC. Therefore, dispersal (and potentially regeneration) of wind‐dispersed trees is favored in regions exposed to stronger wind events, especially in landscapes dominated by regularly shaped patches surrounded by open areas. Conversely, animal‐dispersed seeds are primarily favored by increasing forest cover. Preventing forest loss is therefore critical to promote animal seed dispersal and forest recovery in human‐modified rainforests.

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Section: Methodsmentioning

confidence: 99%

Regional context and dispersal mode drive the impact of landscape structure on seed dispersal

San‐José

Arroyo‐Rodríguez

Meave

2019

Ecological Applications

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“…Corresponde al área de Los Tuxtlas, en el sur de Veracruz. Villaseñor et al (2018) Dinerstein et al, 1995: 97. Ecorregión de los Bosques Húmedos de Tehuantepec Dinerstein et al, 1995: 91. Ecorregión de las Sabanas de Tabasco y Veracruz Dinerstein et al, 1995: 104. Distrito del Bosque Lluvioso del Sur de Veracruz-Tabasco Morrone, 2014a: 51.…”

Section: Distrito De Los Tuxtlasunclassified

Regionalización biogeográfica y evolución biótica de México: encrucijada de la biodiversidad del Nuevo Mundo

Morrone

2019

Rev.Mex.Biodiv.

115

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Resumen La increíble diversidad específica y ecosistémica sitúan a México entre los países megadiversos del planeta. Los patrones biogeográficos de los taxones del país también muestran una notable complejidad. La parte norte de México se sitúa en la región Neártica, mientras que la parte austral pertenece a la región Neotropical. Entre ambas, principalmente en las sierras Madre y la Faja Volcánica Transmexicana, la mezcla de taxones neárticos y neotropicales determina la Zona de Transición Mexicana. Esta encrucijada biótica hace que la diversidad de México sea tan interesante, no solo en términos de sus especies endémicas, sino también en cuanto a sus variadas relaciones filogenéticas y las hipótesis que se han formulado para explicar cómo taxones de orígenes diversos, se han ensamblado en la Zona de Transición Mexicana. Adicionalmente, el país posee casi todos los tipos de vegetación, con desiertos, bosques tropicales y templados, pastizales y yermos de alta montaña. Se revisa la regionalización biogeográfica del país, reconociéndose 2 regiones, 1 zona de transición, 14 provincias y 42 distritos.

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“…To obtain the species richness values used in the species accumulation curves, we located all of the registers (separated by source) on a map. We then generated a grid with 4 × 4 km cells (total of 54 cells), and we obtained the richness for each cell (Villaseñor et al 2018). In addition, for each source, the distribution maps of the registers were generated to visualize the distribution.…”

Section: Methodsmentioning

confidence: 99%

Why continue with floristic checklists in Mexico? The case of the Tacaná-Boquerón Priority Terrestrial Region, in the Mexican State of Chiapas

et al. 2019

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Background: Some regions of Mexico have been relatively well explored floristically and estimates of the vascular plant richness they contain have been obtained. However, there are still regions that require effort to obtain the most appropriate lists of flora possible that consider both systemization of the information and that benefit from recent botanical explorations.Questions: What is the species richness of vascular plants in the Tacaná-Boquerón Priority Terrestrial Region? What proportion of the species are endemic or included in risk categories?Study sites and dates: Tacaná-Boquerón Priority Terrestrial Region, Chiapas State, Mexico. This region is on the Guatemala border and covers an area of 57,400 ha. Between 1920 and 2015.Methods: A database of 14,487 vascular plant records was integrated. Two sources of information were compared: systematization of databases, and recent botanic expeditions.Results: We found 2,485 native species belonging to 185 families. Both data sources were complementary in order to obtain a more complete floristic checklist (systematization of database: 1,774 spp., recent botanic expeditions: 1,514 spp.). As novelties, we found three new species and seven new reports for Mexico. Approximately 14 % of the species documented are included in risk categories or are endemic to the study site.Conclusions: Our checklist is one of the largest in the region (Mexico and Central America) in terms of species count. Our study shows the importance of conducting botanical explorations to complement the information on vascular plant richness in relatively well-explored areas of Mexico.

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High Richness of Vascular Plants in the Tropical Los Tuxtlas Region, Mexico

Cited by 22 publications

References 31 publications

Regional context and dispersal mode drive the impact of landscape structure on seed dispersal

Regional context and dispersal mode drive the impact of landscape structure on seed dispersal

Regionalización biogeográfica y evolución biótica de México: encrucijada de la biodiversidad del Nuevo Mundo

Why continue with floristic checklists in Mexico? The case of the Tacaná-Boquerón Priority Terrestrial Region, in the Mexican State of Chiapas

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